Mte Hss DIN 338 Drill Bit Cylindrical Shank Short Ground Type 20 mm

Mte HSS DIN 338 Drill Bit Cylindrical Shank Short Ground Type 20 mm

Short Series, Ground Type, High Precision, and Solution for M22 Pre-threading Applications

The Mte HSS DIN 338 Drill Bit (20.0 mm) Short Series, Ground Type is a large-diameter, high-quality cutting tool designed for precision drilling operations. This drill bit is ideal for applications requiring high tolerance and excellent surface finish, especially for large diameters. It has a sharper geometry and a more accurate diameter compared to roll-forged types. Its 20.0 mm diameter is critically important in heavy manufacturing and machine assembly, as it serves as the pre-drill diameter for M22 metric standard threads (2.5 mm pitch), reducing the load on the tap, or as a suitable clearance hole for M20 bolts.

The core strength of the product comes from its HSS (High-Speed Steel) material and specifically its Ground manufacturing method. Ground bits offer higher precision, sharper cutting edges, and better chip evacuation compared to roll-forged bits.

Technical Specifications and Material Details

The Mte Drill Bit has optimized features for M22 pre-threading and general-purpose drilling applications.

Feature Name	Detailed Description
Diameter (Nominal)	20.0 mm
Standard	DIN 338: German standard for twist drill bits with cylindrical shanks and standard short length.
Manufacturing Method	Ground: The bit is fully ground from solid steel. This ensures high precision, tighter tolerances, and excellent surface quality.
Material Type	HSS (High-Speed Steel): Offers high wear resistance and toughness. Does not contain cobalt (Standard HSS).
Surface Treatment	Bright finish (typically).
Shank Type	Cylindrical Shank: The shank diameter of large-diameter bits is typically reduced to 13 mm (Reduced Shank).
Point Angle (Approx.)	Typically 118° point angle. (Offers better centering and cutting performance due to its precise geometry).
Cutting Direction	Right Hand Cutting

Applications and Industries Used

This drill bit is used particularly in large-diameter applications requiring M22 pre-threading and general assembly holes:

Machine Manufacturing and Assembly: Pre-drilling for M22 metric standard threads (for standard 2.5 mm thread pitch). While 19.5 mm is ideal, 20.0 mm reduces the load on the tap, minimizing the risk of tap breakage.

General Metal Fabrication: Drilling assembly holes in medium and thick sections of steel, stainless steel (low alloy), cast iron, and aluminum profiles.

Plumbing and Construction: Drilling in steel structures, pipelines, and flanges.

Mold and Tool Manufacturing: Preparation for precise and large-diameter tapping operations, especially where torque control is difficult.

M20 Bolt Clearance Hole: Provides a suitable and reliable clearance hole for M20 bolts.

User Information and Benefits

This product appeals to users seeking high precision and reliable performance for M22 tapping operations:

Safety in M22 Threading Applications: While 19.5 mm is the ideal pre-drill for M22 (2.5 mm pitch) threads, using a 20.0 mm diameter slightly reduces thread engagement. This significantly reduces the risk of tap breakage, especially in hard materials or when hand tapping (with a slight trade-off in thread strength).

M20 Bolt Clearance Hole: One of its most common uses is to drill a hole through which M20 bolts can easily pass. Ground manufacturing ensures the hole is precise and smooth.

High Precision and Surface Quality: Thanks to the ground manufacturing method, the hole diameter and position are extremely precise. It provides a smoother surface finish in large-diameter holes.

Sharper Cutting Edges: Sharper cutting edges compared to roll-forged types require less cutting force and produce cleaner holes.

DIN 338 Short Series: The short design minimizes vibration and deflection, allowing for more stable drilling.